A$$copper$$pot$$with$$a$$mass$$of$0\mathrm{.}485$kg$$contains$0\mathrm{.}175$kg$$of$$water$,$and$$both$$are$$at$$a$$temperature$$of$20\mathrm{.}0?$C$.$A$0\mathrm{.}250$kg$$block$$of$$iron$$at$83\mathrm{.}5?$C$$is$$dropped$$into$$the$$pot$.$Find$$the$$final$$temperature$$of$$the$$system$,$assuming$$no$$heat$$loss$$to$$the$$surroundings$.$